Process of saturating felt



L. KIRSCHBRAUN.

PROCESS OF SATURATING FELT.

Patented May 30, 1922.

State of Illinois,

. to about 350 PATENT OFFICE.

LESTER KIRSCHBRAUN, OF CHICAGO, ILLIhT 01B.

racemes or saruaarme rmr.

. Applieation'flled November 21, 1919, Serial No. 339,691.

' To all whom may concern:

I Be it known that I, LESTER K113 GHBRAUN. a citizen of the United States,, esiding in the city of Chicago, county'of Cook, and have invented certain new and useful Improvements in Brocesses of saturating Felt, of which the following is a specification.

The object of the it is leaving the (paper machine and while it is being Woun up into rolls. Most of the roofing felt is made on single cylinder machines in which the felt passes over dry ing rolls to remove the water from the sheet. In the commercial manufactiire of felt, the sheet is hot as it passes from the drying rolls to the winding rolls. At this point,'the sheet of rom water, the hot air in the pores being expended, and the sheet is in a'relatively highly bibulous condition. In other words, the sheet at this time is in the optimum condition for receiving the saturant,

As is well known, the dry felt is saturated by passing it through a hot tank containing the hot asphaltic saturant. This is known as tank saturated felt. In practical operation, in the roofing industry, serious dithculties are encountered in saturating felt in this manner. The felt is made at the felt mill, rolled lip-"and shipped to the roofing plant and these rolls as they stand around, accumulate-moisture-to as much as 5% to 8%. This moisture has to be removed before the felt can be satisfactorily saturated. The cold felt as it passes into the hot bath of asphalt in the tank is heated to 400 F. This, of course, will evaporate the water but the water must evaporate before the asphalt can penetrate into the felt. This is obvious, of course, be-

cause the water converts into steam and 1 issues from the pores, precluding the possiility of any saturant entering at the same time. Much difiiculty is experienced in foaming in these saturating tanks which requires that the operation be slowed down so that the tanks do not flow over. This, of course, is a serious objection where a maximum out-put is desired. In fact, the greater part of the travel of the felt through the saturating tank is consumed in the removal of the water. Another objection to this method is the tendency to tear the specification of lettera Patent.

present invention is to saturate ordinaryv roofing felt just as I felt is practically free rant onto the Patented May 30, 1922. Renewed November 7,1921. Serial No. 513,588.

felt in its passage through the tank under the required tension. All of the above objections are overcome 1n the operation of my process, in which the saturant is applied to the sheet immediately as 1t -leaves the drying rolls of the paper machine and While the sheet is still hot.

y process is carried out aslfollows: To more clearly illustrate the invention,

ave shown a diagrammatic view of the drying rolls and the two sets of winding rolls of an ordinary paper machine for making felt.

Referring in detail to this drawing, 1 designates the dryi g rolls, 2 and 3 the init1al winding rolls which are used alternately, the cutters 4 for trimming the ed es of the felt and 5 the rewindin rolls. etween the cutters 4 and rewindi ace a spout 6, the outlet of ormed ng rolls 5, which may as ,to pro ect the asphaltic der pressure if desired. The spray may be dispensed with and any suitable form of nozzle used.

desired, a suction box 9 may be sup ported beneath the sheet. It will be noted that the saturant is applied to the felt at the point where the lap of the incoming sheet is tangential to the already wound roll. the vacuum box is used, it is A the removal of the hot air in the pores of the sheet and facilitate the entrance of the saturant into said pores. As the sheet is wound up, the saturant will tend to further work felt and diffuse unisheet to form comwound up roll cools, the air in the pores contracts, thus sucking in the saturation.

may or may not be air proof saturants may, of course, be used. It is to be noted that an excess saturation is not to be employed as otherwise there would be a tendency for the saturated felt to stick when wound up. To lessen any tendency of this character, I provide a squeeze roller 10,

Q iam preferably of steel, suitably mounted on an the spoutand also where desired, byclosing arm 11, which is pivoted at 12 and provided valve 6 and opening valve 6, the saturant on the opposite side of the pivot with a secmay be entirely out off from the spout and o'nd arm .13 carrying a counter weight l4, allowed to circulate through the pump,

the object being to hold the roller 10 in fr1c thereby avoiding the necessity of stopping tional engagement with the roll of the felt the pump;

and squeeze out any excess-saturatlon. Icla m as my invention:

In order that thevacuum box may at all 1. A process of saturating felt conslstmg times be in contact with the sheet, as the in applymg an asphalt in a hot liquid condiameter of the roll increases, the box is dition to the hot sheet, as the latter passes preferably mounted on an arm 15, pivoted at beyond the drying rolls and finally-winding 16 to a sultable support. The arm is proup the sheet after the saturant is applied vided with an extension 15 carrying an adand while the sheet is still hot. justable counter weight 17 2. A process of saturating felt, conslsting 15 In the pipe line 6 leading from the pump in applying a hot bituminous saturant in to the spout 6 is a valve 6 for controlling liquid form to the one face of the hot dry the su ly of saturant to the spout, said pipe sheet, at or adjacent the point where it is line b ingadj'ustably, secured at 6 to the being wound up.

pump connection 6 which connection is pro-. 3. A process of saturating felt, consisting 20 vided with a pipe line 6 having a controlling in applying a waterproof saturant in hot valve 6 therein. The pipe line 6 leads to liquid condition to one face of a heated sheet the source of supply of the saturant (not as the latter passes beyond the drying rolls, shown). and winding up the sheet after the saturant It-will be noted that the valve 6" permits is app ied. regulation of the supply of the saturant to LESTER KIRSOHBRAUN. 

